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28 March 2024
 
  » arxiv » astro-ph/0309066

 Article overview


Structure and Evolution of Starburst and Normal Galaxies
Bahram Mobasher ; Shardha Jogee ; Tomas Dahlen ; Duilia De Mello ; Christopher Conselice ; Norman Grogin ; Mario Livio ;
Date 2 Sep 2003
Journal Astrophys.J. 600 (2004) L143-L146
Subject astro-ph
AffiliationSTScI), Shardha Jogee (STScI), Tomas Dahlen (STScI), Duilia De Mello (GSFC), Christopher Conselice (Caltech), Norman Grogin (JHU), Mario Livio (STScI
AbstractWe study the rest-frame morphology and structural properties of optically selected starburst galaxies at redshift z < 1, using multi-waveband (BViz) high resolution images taken by the Advanced Camera for Surveys (ACS) as part of the Great Observatories Origins Deep Survey (GOODS). We classify galaxies into starburst, early and late types by comparing their observed spectral energy distributions (SEDs) with local templates. We find that early-type systems have significantly higher rest-frame B -band concentration indices and AGN fraction (> 25%) than late-type spirals and optically-selected starbursts. These results are consistent with the scenario in which early-epoch (z > 1) gas-rich dissipative processes (e.g., major mergers) have played an important role in developing large central concentrations in early-type E/Sa galaxies, leading to concurrent growth of central black holes and bulge formation in some of these early merger events. The starbursts have, on average, larger asymmetries than our control sample of normal galaxies, suggesting that a significant fraction of the starburst activity is tidally triggered.
Source arXiv, astro-ph/0309066
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